Re: C5510 Application doesn't work after FlashBurn with .cinit allocated in SDRAM

Xiyu Shi-

> I am using a Spectrum Digital TMS320VC5510 DSK board to develop an
> application. The application, after FlashBurn to the onboard FlashROM,
> runs OK if I allocate the Data Initialization Section (.cinit) in the
> SARAM(or SARAM_A/_B) via the GUI BIOS/DSP Config interface. However
> if I allocate the .cinit section in SDRAM and FlashBurn to the
> FlashROM, it does not work (or boot).
>
> My application has to use the SDRAM for .cinit allocation. Did I
> miss something or something in my linker and hex55 option is wrong?

Where/when is your SDRAM initialized? Functions in the .cinit section (for example,
auto_init) must run early -- before any C code runs, including DSP/BIOS -- so that
means you would need some type of asm code at the _cint00 (entry point) vector to
initialize SDRAM (i.e. correctly set 55x onchip EMIF registers).

My guess is that SDRAM is not correctly initialized when auto_init() (and probably
also BIOS_init) runs, therefore your C code fails because variables declared as const
and static are not initialized correctly.

> In the Linker option, I have
> tried both the Run-Time Autoinitialization (-c) and the Load-Time
> Initialization (-cr); the results are same.

Load-time initialization would mean your Atmel code is handling C code variable
initialization, which requires information in the COFF (.out) file which I think is
not carried forward by hex55.exe. Such host code is fairly complex and requires a
thorough understanding of the COFF format and specific TI enhancements to it --
doesn't sound to me like you're doing that.

To find out more about what .cinit does at run-time, search TI's site for
auto-initialization.

-Jeff

> I have used the following Hex55 options in the convert command file:
>
> myApplication.out
> -m2
> -boot
> -map myApplicationHex.map
> -parallel16
> -v5510:2
> -o myAPplication.hex
>
> ROMS {
> PAGE 0 : ROM : o=0x400000 , l = 0x80000
> }
>
> Thanks for you help.
>
> Regards,
>
> Xiyu Shi
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